CN100440015C - Coplanar Switching Mode Liquid Crystal Display Devices - Google Patents

Abstract

The invention discloses an IPS mode LCD device, in which liquid crystal molecules are oriented at multiple angles in a unit pixel area to increase the response speed and improve the transmittance-voltage characteristic without reducing the aperture ratio. The IPS mode LCD device includes: a plurality of gate lines and a plurality of data lines crossing each other on a first substrate to define a plurality of unit pixel areas, wherein each unit pixel area is divided into first, second and third sub-areas . Thin film transistors are provided at each intersection. The common line is parallel to the gate line, and the common electrode is branched from the common line and bent at first, second and third angles in the first, second and third sub-regions respectively, wherein the first angle, the second The angle and the third angle are different from each other. Each pixel electrode is connected to the drain of each thin film transistor and arranged parallel to the common electrode. A liquid crystal layer is provided between the first substrate and a second substrate opposite to the first substrate.

Description

Coplanar Switching Mode Liquid Crystal Display Devices

This application claims the benefit of Korean Patent Application No. P2005-57631 filed on June 30, 2005, the entire contents of which are incorporated herein by reference.

technical field

The present invention relates to a liquid crystal display (LCD) device, and more particularly to an in-plane switching (IPS) mode LCD device in which liquid crystal molecules are oriented at multiple angles in a unit pixel area to improve response without reducing the aperture ratio speed.

Background technique

Recently, flat panel displays including LCD devices have been actively developed. The LCD device changes the optical anisotropy of liquid crystals having fluidity and optical characteristics by applying an electric field to the liquid crystals. LCD devices are widely used due to their features and advantages of light weight, large screen size, high resolution, and low power consumption compared with cathode ray tubes (CRTs).

LCD devices have various operation modes according to the characteristics of liquid crystal and electrode structures. Some exemplary modes of LCD devices include twisted nematic (TN) mode LCD devices, multi-domain mode LCD devices, optically compensated birefringence (OCB) mode LCD devices, vertical alignment (VA) mode LCD devices, and IPS mode LCD devices.

In a TN mode LCD device, liquid crystal directors are aligned at a twist angle of 90° and a voltage is applied to control the liquid crystal directors. In a multi-domain mode LCD device, one pixel is divided into a plurality of domains and main viewing angles of the domains are different from each other to obtain a wide viewing angle of the device as a whole. In the OCB mode LCD device, a compensation film is adhered on the outer surface of the substrate to compensate the phase change of light according to the traveling direction of the light. In a VA mode LCD device, a negative liquid crystal and a vertical alignment film are used to vertically align liquid crystal molecules on the alignment film. In the IPS mode LCD device, two electrodes are formed on one substrate and a liquid crystal director is twisted in a direction parallel to an alignment film.

Wherein, the IPS mode LCD device includes a color filter array substrate and a thin film transistor array substrate arranged opposite to each other, and a liquid crystal layer is sandwiched between them. The color filter array substrate is provided with a black matrix layer for preventing light leakage and an R/G/B color filter layer for displaying colors formed on the black matrix layer. The thin film transistor array substrate is provided with gate lines and data lines defining unit pixels, thin film transistors formed at intersections of the gate lines and data lines, and common electrodes and pixel electrodes alternately arranged to generate lateral electric fields.

A related art IPS mode LCD device will be described below with reference to the accompanying drawings. 1 shows a plan view of a unit pixel of a prior art IPS mode LCD device, FIG. 2 shows a plan view of a unit pixel of a second prior art IPS mode LCD device, and FIG. 3 shows the voltage of a prior art device. - Transmittance diagram.

As shown in FIG. 1 , the TFT array substrate of the first prior art IPS mode LCD device includes gate lines 12 and data lines 15 perpendicularly crossing the gate lines 12 to define unit pixels, TFTs 20 and common lines 25 . A unit pixel includes a plurality of common electrodes 24 and a plurality of pixel electrodes 17 . The thin film transistor 20 is formed in a unit pixel and functions as a switching element. The common line 25 is formed parallel to the gate line 12 . The common electrode 24 is formed extending from the common line 25 in the form of a single body and arranged along the gate line 12 in the unit pixel. The pixel electrodes 17 are alternately formed between the common electrodes 24 and parallel to the common electrodes 24 .

A unit pixel area is divided into a plurality of blocks 30 by the pixel electrode 17 and the common electrode 24 . The signal Vcom is supplied to the common line 25 and the common electrode 24 from the periphery of the active area. Each pixel electrode 17 is connected to the drain 15 b of each thin film transistor 20 to receive pixel signals, so that the liquid crystal molecules in the block 30 are rearranged by the lateral electric field formed between the common electrode 24 and the pixel electrode 17 .

In FIG. 1, the pixel electrode 17 and the common electrode 24 are arranged along the gate line at an angle α of 10° with respect to the gate line (0°). The liquid crystal molecules are initially aligned in the direction of the gate lines 12 and then rearranged by a lateral electric field in a direction perpendicular to the pixel electrode 17 and the common electrode 24 to determine the transmittance of light. In a general IPS mode device, since the maximum transmission angle of liquid crystal molecules relative to the grinding direction is 45°, when a voltage is applied to the initially aligned liquid crystal molecules, the liquid crystal molecules rotate 45°-α, that is, 35°.

In the first prior art IPS mode LCD device as shown in FIG. 1 , a unit pixel area is divided into sixteen blocks 30 .

However, the first prior art IPS mode LCD device has a problem regarding the response speed. That is, the response time of the first prior art device is slow. To solve this problem, as shown in FIG. 2, in the second prior art device, the pixel electrode 117 and the common electrode 124 are arranged along the gate line 112 at an angle β of 20° with respect to the gate line 112 (0°).

In the second prior art device, the liquid crystal molecules are initially aligned along the direction of the gate line 112 and then rearranged by a lateral electric field in a direction perpendicular to the pixel electrode 117 and the common electrode 124 . As described above, the maximum transmission angle of liquid crystal molecules with respect to the rubbing direction is 45°. Thus, in this example, in the second prior art device, when a voltage is applied to the initially aligned liquid crystal molecules, the liquid crystal molecules rotate by 45°-β, ie 25°. Since rotating the liquid crystal molecules by 25° occurs faster than rotating them by 35°, the response speed of the second prior art IPS mode LCD device is improved compared to the first prior art device.

On the other hand, since in the second prior art device, each pixel electrode 117 and each common electrode 124 are arranged with a bending angle of 20° with respect to the gate line 112 instead of 10° in the first prior art device, The number of blocks 130 of pixel electrodes and common electrodes is thus reduced to fourteen, which is less than the number of blocks 30 in the first prior art device.

In other words, in the prior art, if the arrangement angle of the pixel electrode and the common electrode is increased, the number of electrodes formed in a unit pixel area with a fixed size is correspondingly reduced, thereby reducing the number of blocks. When the number of blocks, that is, the number of pixel electrodes and common electrodes decreases, the luminance also decreases. Thus, the trade-off for prior art devices is improvement in response time at the expense of reduced brightness.

In other words, the related art IPS mode LCD device has the following problems.

In the IPS mode LCD device in which the common electrode and the pixel electrode are arranged along the gate line, if the common electrode and the pixel electrode are arranged with a bending angle of 10° with respect to the gate line, the performance of the device is improved due to an increase in the number of blocks. brightness. However, since the rotation angle of the liquid crystal molecules is large, the response speed is reduced.

On the other hand, if the common electrode and the pixel electrode are arranged at a bending angle of 20° with respect to the gate line, the response speed of the liquid crystal molecules increases. However, due to the increased angle of the electrodes, the number of blocks formed in a unit pixel area of a fixed size may decrease, thereby reducing the opening area of the device.

There are other problems with the prior art devices of FIGS. 1 and 2 . FIG. 3 shows voltage-transmittance characteristics of a prior art IPS mode LCD device, in which saturation voltages Vsat1 and Vsat2 are both small in width.

Contents of the invention

Accordingly, the present invention is directed to an IPS mode LCD device that substantially overcomes one or more of the problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide an IPS mode LCD device in which liquid crystal molecules are aligned at multiple angles in one unit pixel area to increase response speed and improve transmittance-voltage characteristics without reducing aperture ratio.

Additional advantages, objects and features of the invention will be set forth in the description which follows and will become apparent to those skilled in the art from the description, or may be learned by practice of the invention. These objectives and other advantages of the present invention can be realized and obtained by the structure specifically pointed out in the description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages, in accordance with the purpose of the present invention, as specifically and broadly described, a coplanar switch mode liquid crystal display device according to an embodiment of the present invention includes: crossing each other on a first substrate to define a plurality of units A plurality of gate lines and a plurality of data lines in the pixel area, wherein each unit pixel area is divided into first, second and third sub-areas. The device also includes a plurality of thin film transistors for each unit pixel arranged at the intersections of the gate lines and the data lines, and a plurality of common lines arranged in parallel with the plurality of gate lines. In each unit pixel, a plurality of common electrodes branch from the common line and are bent at a first angle with respect to the gate line in the first subregion, and are bent at a first angle with respect to the gate line in the second subregion. The wire is bent at a second angle, and is bent at a third angle relative to the gridline in the third sub-region, wherein the first angle, the second angle and the third angle are different from each other. The device also includes a plurality of pixel electrodes connected to the drains of the thin film transistors in the unit pixel and arranged in parallel with the plurality of common electrodes. A liquid crystal layer is provided between the first substrate and a second substrate opposite to the first substrate.

The electrodes in the unit pixel may be bent at different angles in different sub-regions. For example, the common electrode and the pixel electrode are bent at an angle of 20° in the first sub-region, bent at an angle of 15° in the second sub-region and 10° in the third sub-region The angle is bent so that the liquid crystal molecules initially aligned along the gate line (0°) are re-aligned in multiple directions to improve the response speed.

The thin film transistor is arranged in the first sub-region to obtain an optimized number of blocks in the unit pixel region, thereby improving the brightness of the device.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Description of drawings

The accompanying drawings, which are included to provide a further explanation of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the attached picture:

1 shows a plan view of a unit pixel of a first prior art IPS mode LCD device;

2 shows a plan view of a unit pixel of a second prior art IPS mode LCD device;

Fig. 3 shows the graph of voltage-transmittance relation curve of prior art device;

4 shows a plan view of a unit pixel of an IPS mode LCD device according to an embodiment of the present invention;

5A to 5C show enlarged plan views of subregions I, II and III in FIG. 4;

Figure 6 shows a graph of the voltage-transmittance relationship of a device according to an embodiment of the present invention; and

FIG. 7 shows an exemplary thin film transistor according to an embodiment of the present invention.

Detailed ways

Preferred embodiments of the present invention will be described in detail below with reference to Examples shown in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

4 shows a plan view of a unit pixel of an IPS mode LCD device according to an embodiment of the present invention, and FIGS. 5A to 5C show enlarged plan views of sub-regions I, II and III in FIG. 4 , and FIG. Voltage-transmittance graphs of devices according to embodiments of the invention, and FIG. 7 shows exemplary thin film transistors according to embodiments of the invention.

As shown in FIG. 4, the thin film transistor array substrate of the IPS mode LCD device according to the present invention includes a plurality of gate lines 512 arranged along one direction and a plurality of data lines 515 crossing the gate lines to define a unit pixel area. The unit pixel area is divided into sub-areas I, II, and III, respectively.

For each unit pixel, a thin film transistor 520 is included to function as a switching element. The unit pixel also includes a common electrode 524 branched from a common line 525 to supply the signal Vcom thereto. The common electrode is bent at different angles in sub-regions I, II and III.

The unit pixel includes a pixel electrode 517 corresponding to the common electrode 524 . Each pixel electrode 517 is connected to the drain 515 b of the thin film transistor 520 through the contact hole 518 to form a lateral electric field with the common electrode 524 .

Although three sub-regions are shown, this is exemplary and the invention is not limited thereto. The number of sub-regions may be two or more.

Referring again to FIG. 4 , in each sub-region, the common electrode 524 and the pixel electrode 517 are bent at substantially the same angle with respect to the gate line 512 . Also, the bending angles of the pixel electrode 517 and the common electrode 524 are different in the sub-regions I, II and III. As shown in FIGS. 5A to 5C, the common electrode 524 is bent at an angle of 20° to the pixel electrode 517 in sub-region I, bent at an angle of 15° in sub-region II, and bent at an angle of 10° in sub-region III. bending. The liquid crystal molecules 550 initially aligned in the grid line direction have the same grinding effect as the bending angle of electrodes bent at different constant angles.

Therefore, the liquid crystal molecules 550 initially ground along the grid line (0°) are rearranged at a rotation angle of 45° relative to the grinding direction by the lateral electric field formed between the pixel electrode 517 and the common electrode 524 to determine the transmittance of light. When a voltage is applied to the liquid crystal molecules to drive a white screen, since the electrode angle is 20° in the sub-region I, the liquid crystal molecules 550 rotate by 25°. Since the electrode angle is 15° in the sub-region II, the liquid crystal molecules 550 are rotated by 30°. Since the electrode angle is 10° in the subregion III, the liquid crystal molecules 550 are rotated by 35°. When an electric field is applied, the liquid crystal molecules 550 in the sub-regions I, II, and III rotate together due to mutual action caused by their viscosity. Therefore, the response speed of the liquid crystal molecules becomes fast. In addition, a driving voltage for driving liquid crystal molecules can be reduced.

Again, the implementations shown here are examples only. The number of sub-regions is not limited to three. Also, the bending angles of the pixel electrode 517 and the common electrode 524 are not limited to specific values shown in FIG. 5 . Preferably, the bending angle of the electrode-pixel electrode or the common electrode in a sub-region is different from the bending angle of the same electrode in an adjacent sub-region. And preferably, the electrodes span all sub-regions to achieve the advantages of increased response speed and increased brightness.

Referring to FIG. 6, which shows the voltage-transmittance curve of the present embodiment, it should be noted that the saturation voltage Vsat3 according to the IPS mode LCD device having multi-angle electrodes has a larger width than that of the prior art IPS mode LCD device.

As an example, assume that the saturation voltage required to rotate liquid crystal molecules ground at an angle of 15° relative to the electrodes by an angle of 45° is 15V (common electrode of 7V). Then, since liquid crystal molecules ground at an angle of 20° according to the present embodiment need a different value of 25° to rotate at an angle of 45°, they can be driven by a voltage of 14V. The liquid crystal molecules ground at an angle of 10° according to an embodiment of the present invention have a fast response speed under the action of liquid crystal molecules ground at an angle of 20° due to their viscosity. Therefore, the saturation voltage may be in the range of 14V-15V in the multiple grinding angle mode. This is a considerable increase in the tolerance of the driving voltage.

Furthermore, when the common electrode 524 and the pixel electrode 517 are arranged at different bending angles in the subregions I, II, and III, the block 530 located between each pixel electrode 517 and each common electrode 524 maintains the width d, and the pixel The electrode 517 and the common electrode 524 have the same width d.

The common line 525 may be disposed in the middle of the pixel area. When so arranged, the pixel electrode 517 and the common electrode 524 at upper and lower portions of the pixel area are arranged symmetrically with respect to the common line 525 . The width d between the pixel electrode 517 and the common electrode 524 corresponds to the vertical width between the two electrodes. If the lengths of the respective electrodes vary, the driving voltage varies when driving a white screen in the normally black mode. Therefore, preferably, the length between the respective electrodes is kept uniform.

As described above, since the pixel electrode and the common electrode at the upper and lower portions of the pixel area are arranged symmetrically at a plurality of bending angles, redundancy occurs at the portion where the gate line and the data line intersect in the sub-region I where the electrode is bent at an angle of 20°. Tolerance (redundant margin). In other words, in the sub-regions where the electrodes are arranged at large bending angles, a redundant space is obtained which maximizes the aspect ratio of the electrodes. The thin film transistor 520 may be disposed in the redundant space to obtain sufficient margin of the thin film transistor design area (W/L).

Generally, in a unit pixel area having a plurality of sub-areas, preferably, the bending angle of the electrode is largest in a sub-area adjacent to a crossing of a gate line and a data line (in an area where a switching element is disposed). As mentioned above, this provides redundant space to maximize the aspect ratio. Along similar lines, preferably, the bending angle of the electrode is greater in sub-regions closer to the intersection of gate and data lines than in sub-regions farther from the same intersection.

When the common line is placed in the middle of the unit pixel, preferably, the pixel electrode and the common electrode are arranged symmetrically with respect to the common line. When so arranged, for any specific pixel electrode or common electrode, there should be another electrode arranged at substantially the same bending angle and another electrode arranged at substantially symmetrical bending angles corresponding to the gate line.

The pixel electrode and the common electrode are arranged with multiple bending angles, which can optimize the design of the unit pixel area. Therefore, the number of blocks 530 can be increased to increase the aperture ratio.

The arrangement pattern of the pixel electrode and the common electrode according to the present embodiment has advantages of a device in which electrodes are arranged at a large bending angle and an advantage of a device in which electrodes are arranged at a small bending angle.

Referring again to FIG. 4, the gate line 512, the common line 525, and the common electrode 524 are formed of opaque metals such as Cu, Al, AlNd (aluminum neodymium), Mo, Cr, Ti, Ta, and MoW and are flush with each other. The common line 525 and the common electrode 524 may be integrally formed of the same material. Each pixel electrode 517 is formed of a transparent conductive layer such as indium tin oxide (ITO) or indium zinc oxide (IZO).

FIG. 7 shows an exemplary thin film transistor 520 in accordance with an embodiment of the present invention. The TFT 520 includes a gate 712 and a common electrode 714 disposed above the substrate 702 . A gate insulating layer 710 is provided over the gate electrode 712 and the common electrode 714 and the substrate 702 . A semiconductor layer 716 is provided over the gate insulating layer 710 and the gate electrode 712 to serve as a channel of the TFT 520. A drain 720 is formed on one side of the semiconductor layer 716 and a source 718 is formed on the other side. A passivation layer 722 is provided over the TFT structure. A pixel electrode 726 is provided through the contact hole 724 . The gate insulating layer 710 and the passivation layer 722 may be formed by depositing an inorganic insulating material such as SiNx and SiOx using a plasma enhanced chemical vapor deposition (PECVD) method.

The gate 712 may be connected to the gate line 512 of FIG. 4 . Actually, the gate 712 may be integrally formed with the gate line 512 . The drain electrode 720 may be connected to the data line 515 or integrally formed with the data line 515 . The drain 720 , the contact hole 724 , the pixel electrode 726 and the common electrode 714 in FIG. 7 may correspond to the drain 515 b , the contact hole 518 , the pixel electrode 517 and the common lines/electrodes 525 , 524 in FIG. 4 .

A storage capacitor is formed at a portion where the common line 525 and the common electrode 524 applied with the signal Vcom overlap with the pixel electrode 517 applied with the pixel voltage. In FIG. 7 , this corresponds to the pixel electrode 726 overlapping the common electrode 714 . The storage capacitor is used to maintain the voltage applied to the liquid crystal layer during the turn-off period of the thin film transistor to prevent deterioration of image quality due to parasitic capacitance.

The thin film transistor array substrate and the color filter array substrate are bonded together by setting a liquid crystal layer between them. The color filter array substrate includes a black matrix layer, a color filter layer and a coating layer. The thin film transistor array substrate and the color filter array substrate are further provided with an alignment film on their inner side to initially align the liquid crystal layer along the gate line (0°).

In an embodiment of the present invention, the common electrode and the pixel electrode are arranged at a plurality of bending angles in a plurality of sub-regions. For example, the common electrode and the pixel electrode are bent at an angle of 20° in sub-region I, at an angle of 15° in sub-region II, and at an angle of 10° in sub-region III. However, the pixel electrode and the common electrode can be designed to be optimized at different angles and are not limited to the above-mentioned angles.

As described above, the IPS mode LCD device according to the present invention has the following advantages.

First, since the common electrode and the pixel electrode are arranged at multiple bending angles to obtain multiple orientation angles of liquid crystals in one unit pixel area, an optimized number of blocks can be obtained, thereby improving the brightness of the device.

Second, since the saturation voltage has an increased width, transmittance-voltage characteristics can be improved.

Third, since a redundancy margin is obtained in a sub-region where the common electrode and the pixel electrode are arranged at a large bending angle, sufficient margin of the thin film transistor can be obtained.

Finally, since the common electrode and the pixel electrode are arranged at multiple bending angles, the response speed of the liquid crystal molecules is fast in the sub-regions where the electrodes are arranged at large bending angles. Since the liquid crystal molecules in the adjacent sub-regions interact with the liquid crystal molecules in the sub-region with the fastest liquid crystal molecule response speed, the overall response speed becomes faster. In this way, the driving voltage for driving the liquid crystal molecules can be reduced.

Obviously, those skilled in the art can make various modifications and improvements to the present invention without departing from the spirit or scope of the present invention. Thus, it is intended that the present invention cover all modifications and improvements of this invention that come within the scope of the appended claims and their equivalents.

Claims (25)

1, a kind of in-plane switching mode liquid crystal display device comprises:

Thereby be arranged on many grid lines and many data lines that limit a plurality of unit pixel regions intersected with each other on first substrate, wherein the constituent parts pixel region is divided into first, second and the 3rd subregion;

Be arranged on a plurality of infalls a plurality of thin film transistor (TFT)s that are used for the constituent parts pixel everywhere of grid line and data line;

Many concentric lines that be arranged in parallel with described many grid lines;

A plurality of public electrodes from described each concentric line branch, wherein each public electrode in described first subregion with respect to described grid line with first angular bend, in described second subregion with respect to described grid line with second angular bend, and in described the 3rd subregion with respect to described grid line with the bending of third angle degree;

The a plurality of pixel electrodes that are connected to each thin film transistor (TFT) and be arranged in parallel with described a plurality of public electrodes; And

Be arranged on the liquid crystal layer between described first substrate and second substrate relative with described first substrate, wherein first angle, second angle and third angle degree are differing from each other.

2, according to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that, also comprise the oriented film that is arranged on described first substrate and the second substrate inboard.

According to the described in-plane switching mode liquid crystal display device of claim 2, it is characterized in that 3, described oriented film is along described grid line initial arrangement.

4, according to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that first angle of described first subregion is greater than second angle of second angle of described second subregion and described second subregion third angle degree greater than described the 3rd subregion.

5, according to the described in-plane switching mode liquid crystal display device of claim 4, it is characterized in that described each thin film transistor (TFT) is arranged in described first subregion of corresponding unit picture element and is intersected with each other at grid line described in described first subregion and data line.

6, according to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that, the public electrode of described constituent parts pixel region and pixel electrode in described first subregion with 20 ° angular bend roughly, in described second subregion with 15 ° angular bend roughly, and in described the 3rd subregion with 10 ° angular bend roughly.

7, according to the described in-plane switching mode liquid crystal display device of claim 6, it is characterized in that, described each thin film transistor (TFT) be arranged in described first subregion of corresponding unit picture element and described grid line and data line intersected with each other in described first subregion.

8, according to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that, for each public electrode of described constituent parts pixel and corresponding pixel electrode, between described public electrode and the corresponding pixel electrode apart from substantially constant.

According to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that 9, described concentric line is arranged in the basic zone line of described pixel region.

According to the described in-plane switching mode liquid crystal display device of claim 9, it is characterized in that 10, about described concentric line, described pixel electrode and the public electrode that is positioned at the office, top and the bottom of each pixel region is symmetrical arranged with respect to described concentric line.

According to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that 11, the public electrode of described constituent parts pixel and described concentric line are with the monomer setting.

According to the described in-plane switching mode liquid crystal display device of claim 1, it is characterized in that 12, described each thin film transistor (TFT) comprises grid, semiconductor layer and source electrode and drain electrode.

13, a kind of unit picture element of in-plane switching mode liquid crystal display device, wherein said unit picture element are arranged on by two grid lines and two data lines and intersect in the unit pixel regions that limits, and this unit picture element comprises:

Be arranged on a plurality of pixel electrodes in the described unit pixel regions, wherein each pixel electrode is designed to apply the pixel voltage from described data line; And

A plurality of public electrodes of relative set in described unit pixel regions, thus wherein each public electrode is designed to apply common electric voltage and forms electric field with corresponding pixel electrode;

Wherein said unit pixel regions is divided into a plurality of subregions, and each unit pixel regions is divided into first subregion, second subregion and the 3rd subregion,

Wherein at least one pixel electrode is across all subregions, and

Wherein, each pixel electrode in described first subregion with respect to described grid line with first angular bend, in described second subregion with respect to described grid line with second angular bend, and in described the 3rd subregion with respect to described grid line with the bending of third angle degree, wherein first angle, second angle and third angle degree are differing from each other.

14, according to the described unit picture element of claim 13, it is characterized in that, with the corresponding public electrode of described at least one pixel electrode across all subregions.

According to the described unit picture element of claim 13, it is characterized in that 15, first angle of described first subregion is greater than second angle of second angle of described second subregion and described second subregion third angle degree greater than described the 3rd subregion.

16, according to the described unit picture element of claim 13, it is characterized in that, substantially the same with the angle of bend of the angle of bend of the corresponding described public electrode of described at least one pixel electrode and described at least one pixel electrode at least one subregion.

17, according to the described unit picture element of claim 16, it is characterized in that, substantially the same with the angle of bend of the angle of bend of the corresponding described public electrode of described at least one pixel electrode and described at least one pixel electrode in all subregions.

18, according to the described unit picture element of claim 13, it is characterized in that, substantially the same at the angle of bend of another pixel electrode of angle of bend and at least one of at least one pixel electrode described in all subregions.

According to the described unit picture element of claim 13, it is characterized in that 19, all pixel electrodes and all public electrodes make that across all subregions each has substantially the same angle of bend to pixel electrode and corresponding public electrode in all subregions.

20, according to the described unit picture element of claim 13, it is characterized in that, also further comprise concentric line, wherein all public electrodes are from described concentric line branch.

According to the described unit picture element of claim 20, it is characterized in that 21, described all public electrodes and described concentric line are integrally formed by identical materials.

22, according to the described unit picture element of claim 20, it is characterized in that, described concentric line is set with across all a plurality of subregions at the middle body basically of described unit pixel regions.

According to the described unit picture element of claim 22, it is characterized in that 23, described pixel electrode and public electrode are set to respect to described concentric line substantial symmetry.

24, according to the described unit picture element of claim 13, it is characterized in that, also comprise the switching device that is used for providing to described pixel electrode described pixel voltage based on the control voltage on the described grid line.

According to the described unit picture element of claim 24, it is characterized in that 25, described switching device is a thin film transistor (TFT).

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